Aman Singh-Mann, 29, manager of the Nisa store in Kelvedon Hatch, England, said a masked man came into the store around 5:15 p.m. Sunday and demanded a female staff member open the cash register, the Brentwood Weekly News reported Thursday.
"I was just out the back having a break when I heard the shouting," Singh-Mann said. "It was a man shouting 'open the till.' I went out and saw the man and he was waving the knife around. I grabbed the first thing I could and threw it at him." Singh-Mann said he threw beer at the robber until he fled the store.
Police said they are trying to identify a suspect.